The marine mammal, a white whale named NOC, copied the sound of people so well that at first, researchers thought they were hearing humans conversing in the distance. A diver who worked with NOC once even left the water, wondering, "Who told me to get out?" The voice turned out to be that of NOC.
"They are highly vocal animals," lead author Sam Ridgway of the National Marine Mammal Foundation told Discovery News, adding that NOC was not the first to copy human speech.
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A Whale with a Human Voice : Discovery News